Align backslash vertically

src/Makefile.am

diff --git a/src/Makefile.am b/src/Makefile.am
index 907d606..3a469fd 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -106,7 +106,7 @@
   google/protobuf/compiler/plugin.pb.h                          \
   google/protobuf/compiler/cpp/cpp_generator.h                  \
   google/protobuf/compiler/java/java_generator.h                \
-  google/protobuf/compiler/java/java_names.h                \
+  google/protobuf/compiler/java/java_names.h                    \
   google/protobuf/compiler/javanano/javanano_generator.h        \
   google/protobuf/compiler/python/python_generator.h            \
   google/protobuf/compiler/ruby/ruby_generator.h